win8 metro 增加顶部栏，添加上传按钮

   <UserControl.Resources>
        <Style x:Key="UploadViewAppBarButtonStyle" TargetType="Button" 
           BasedOn="{StaticResource AppBarButtonStyle}">
            <Setter Property="AutomationProperties.AutomationId" Value="UploadViewAppBarButton"/>
            <Setter Property="AutomationProperties.Name" Value="上传图片"/>
            <Setter Property="Content" Value="&#xE12B;"/>
        </Style>
       ...
    </UserControl.Resources>

    <Page.TopAppBar>
        <AppBar Padding="10,0,10,0">
            <Grid>
                <Button Click="UploadImage_Click" HorizontalAlignment="Right" 
                    Style="{StaticResource UploadViewAppBarButtonStyle}"/>
            </Grid>
        </AppBar>
    </Page.TopAppBar>